| 摘要 |
PURPOSE:To reduce the power consumption of a subscriber charging instant informing device, by applying a power supply to a device only during the call, without increasing the number of connecting cables between a control section and a call meter panel section. CONSTITUTION:When a loop monitor section 42 monitors a signal from a station CO and catches a main truck, a PH1 or 2 is conductive state and the dial trap state is attained. Further, a transistor(TR) 2 is turned on and a power supply -B is applied to a receiving section 41 and a call meter panel section 3. When Tte operator switches an automatic return switch 32 to a metering position, (a), a relay 35 is energized and contacts 36, 37 are changed over. The relay 35 is self-held with the contact 36. When a received charging pulse signal S1 is detected with the call, a photocoupler PH3 is operated and a TR1 is turned on while the signal S1 is generated and a call meter 31 is counted. When the call is finished, the pH1 or 2 is cut off, and the TR2 is turned off, then the power supply is interrupted. |
